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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fbe4ebdbd54e5b03f6f64f45336430f38d6ff7a3a14097fa6a29ae7c88e5fd' 
  AND token = 'Q1jfuXyJQULjfZGBr3TSyH9Bn2TxpdLfNktqIKcYLOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}